But it's been hell finding an answer, or I just don't know what to look for..I have a prompt that asks for a float, and if the user doesn't put in a valid number, then it should die with an error message.
Code:
def die_with_error():
print 'ERROR: You didn't specify a valid number!'
[code]....
I'm trying to teach myself python (from Learn Python the hardway e-book) but am struggling to grasp the concepts of Classes etc. Part of exercise 43 is to rewrite the game / create a new game with classes for each room etc. So I'll show you my code so far and explain at the bottom my problem
Code:
#ex43a.py
from sys import exit
[code]....
I have a script that i want to add some functionality to, but im new to python. Right now it runs command line as ./script https://server user passwd verbose , which returns alot of informtion. I would like it to be able to only return information for a particular function when a flag is passed. exp: ./script https://server user passwd verbose -m (for memory only)
Under the ClassesToCheck section are the different things that can be retrieved. I would like that when you run the script as ./script https://server user passwd verbose -m, it returns only the 'Memory' info. -c would be for 'CPU', etc... Also, i would like the OK at the end of the script to be the first line that is return in the output instead of the last.
On this link [URL]4 a return type is defined
Code:
return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG);
What is the above function returning.I am not clear with definition of what is being returned in the above code.
I'm getting some information about C language and this session of a C book (follow the above link) is using a bad example for me. When I'm trying this example of function returning a pointer, my compiler is stating a warning that I return a pointer to a local variable. I realized that it is error prone after all this variable may be override before the function has done his execution. And the author is fooling me saying that this example is "perfectly safe". I'm wrong? There is something that I don't got yet? Sorry but this site is preventing me to post the link of book cause I'm a newbie, so a need the hack it. Just strip out the question signs:
{LINK}
?w?w?w
?cs.cf.ac.uk?
[code]....
I going through the Python course on Codeacademy. I have some trouble understanding what I'm doing wrong. This is my code below:
Code: Select alldef count(sequence, item):
total = 0
for x in sequence:
return x
if x in sequence:
total += 1
return total
print count([1,2,1,1], 1 )
The code gives me an error: "Oops, try again. Your function fails on count([1],7). It returns 1 when it should return 0."
It should be outputting 3 because 1 occurs 3 times in the list.
I'm trying to write some code that involves creating a function to return a vector iterator.I'm not sure what is wrong.
Code:
template <typename T> class VectorTemplate
{
[code]....
I am exploring the Python 3 standard library and am currently attempting to test the bin function. It converts an integer into a binary string. I believe the module I wrote is flawed somehow. Here's the source code:
Code:
#!/usr/bin/python3.1
#This module tests the bin() function.
import sys
def get_input():
x = input("Enter an integer: ")
def use_bin():
[code]....
As you can see, the binary form given is always 0b10111. I'm no expert on binary code (or hexadecimal notation), but surely 9000 and two would have different results?
EDIT: Added a line in the module to repeat back what integer the user entered, and then the binary form. It would appear that no matter what integer the user enters, Python thinks it's "23".
Example output:
Code:
>>>
Enter an integer: 1
You entered 23
The binary form of this integer is 0b10111
>>>
If i have a python file with a function call_me(a,b),how can I call this function from the command line ,after i compile the program?
View 5 Replies View RelatedIs there a python equivalent for the "array_unique" function in php?
I have to run a query on a very large table (1.5 million records, with no index!) and php can't beat the max execution time. So I am converting my php script to python, which I have never used before.
my php script basically does this:
gets results from database
gets the number of unique values in column "X"
counts how many times each unique value in column "X" occurs
echos the results
My php script was originally running on a smaller version of the table, I would have started in python if I would have known the "real" table was so large, python is the only language I have access to in my current environment (besides php).
I need to make a function combination to get for: If cell A1 then for B1 as:
A1 B1
--- ---
abc abc
hello hello
empty empty
0 0
-3 -3
5 5
and like wise
Code:
#include <iostream>
using namespace std;
[code]...
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
View 2 Replies View RelatedI want to be able to do
sudo ./program.py
instead of always having to do
sudo python program.py
What do I need to change?
I've already used line split stuff to transform my data into something like this in a text file:
Code:
['1', '1', '3', '20.7505207']
['2', '1', '3', '23.0488319']
['3', '1', '3', '-1.5768747']
['4', '1', '3', '-26.4772491']
[code]....
How can I get this on a python program so I can manipulate it as an array?
I have a function definition in a Python 2.x script which take a tuple as one of its arguments, but 2to3 has no answers nor any of my searching on how to represent the same in Python 3.x
Code:
def blah(self, (string1, string2))
I want to declare a function in a function, but had no success till now, see the error code below and visit the project at sourceforge
[Code]...
I trying to write a UART(interfacing of serial devices) to linux machine but after I execute the following code to receive data I need to enter key (carriage return).... but I don't want to remove carriage return/enter key
[Code]....
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash
addelementtoarray()
{
local arrayname=$1
[code]....
I want that I click with the mouse on the video, it paused.I notice that there is "BaconVideoWidget" which I guess is the video rendering widget but it don't have signal named "clicked":
Code:
vd = totem_object.get_video_widget()
vd.connect("clicked", vd.hide)
[code]....
i am having two small issues with a function i have made.sorry if it is a mess, i am still learning bash.the first is calling the nonpersistssh function (second line) and assigning the return value to nonpersistdiag.the function returns 1, but nonpersistdiag seems to only contain 0. i am unsure on how to proceed.the second problem is the nested else clause on line 10. it is a syntactical error. how would i declare it correctly?
Code: function endsession(){
nonpersistdiag=$[nonpersistssh]# a function that returns an exit code
sudo /etc/init.d/ssh stop; sshdiag=$?
[code]....
What are the uses of return 0, return 1 and exit statements in C
View 4 Replies View RelatedI'm confused about what "echo $0" in a shell actually return. Consider these tests:
Code:
[root@e11apvl151 ~]# # Login shell:
[root@e11apvl151 ~]# echo $0
-bash
[root@e11apvl151 ~]# # Starting a new shell
[root@e11apvl151 ~]# bash
[root@e11apvl151 ~]# echo $0
bash
[root@e11apvl151 ~]# screen
[root@e11apvl151 ~]# echo $0
/bin/bash
Depending on wether the shell is a login shell, a regular shell, or a screen utility, I get different results.
I have a file:
979798707
787862348
766428634
I want to see if all the records in the file are present in the contents of the files of a particular directory.
Basically I want to say if grep doesn't return anything, then report.
For example in /tmp dir I have 4 files and flast 2 values (787862348 and 766428634) are present in the files of /tmp dir, but first one (979798707) is not. I want to echo that in a reporting file.
something like:
while read line
do
# if ! grep -rl $line /tmp
echo $line >> are_not_present
done < "myFile"
How do I achieve " if ! grep -rl $line /tmp"? That is, if the line is found by grep, then grep will print the output, but if grep does'nt find it, it will print nothing. How can I check if grep didn't find it (i.e. printed nothing)?
I'm reading a text file with fscanf using a loop until feof(inFile). How can I return to the top of the file? As in I have one loop that scans until the eof and then after it there's another loop and I want to start from the beginning of the file again scanning to the end of it. How do I get back there?
View 3 Replies View RelatedI am testing the serial ports on a Single Board Computer(SBC) running Linux kernel 2.6.29. I usually do this by connecting the serial port to another PC serial port, then doing "cat /dev/ttyS0" on PC and "echo hello > /dev/ttyS0" on the SBC. However in the current system, "echo hello > /dev/ttyS0" command does not return at all! Also no characters appear on the destination port. I am running the echo command as root. The system boot messages show that the serial port in indeed /dev/ttyS0.
View 2 Replies View RelatedI think my title pretty much explains it. I am writing a script and I want to start a program in the background, and when that program finishes I want to check the return value to make sure there was no error.For example normal I would do something like this:
#!/bin/sh
program
if [ ! $? -eq 0 ]; then
echo "There was an error"
exit 1
fi
Now I want to do something like this:
#!/bin/sh
PRTN=`program1 &`
program2
if [ ! $? -eq 0 ]; then
[code]....
In this case if program2 finishes before program1, I don't think the return value from program1 $PRTN would be valid at the time it is checked.
I am using pthread_create system call to create a thread. However pthread_create does not return the PID ( process ID). Is there any quick way to fınd the PID of the created thread.
View 1 Replies View RelatedC++ code:
Code:
#include<fstream.h>
[code]....
I write a little script by bash.
#!/bin/bash
a=`gawk '/Iterations /{print $0}' hoge.log | gawk 'BEGIN{FS=" "}{print ($4)}'`
a=`expr 3 '*' $a`
[code]...